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The tunnel will be closed to traffic overnight for a training exercise between 10 p.m. and 2 a.m., according to MassDOT.

The drill will simulate a crash and fire involving multiple injuries. It's designed to test response and communications.

"If there was a major incident in the Sumner Tunnel or any tunnel, we want to make sure that everybody has their communication protocols down," said MassDOT's Frank DePaola. "It's better to do it in a drill than to do an actual event."